////////////////////////////////////////////////////////////////////////////////
///  crc32.cpp - dos.h none-inlined functions.
///  The
///
///  Created by Alexander Zvyagin on 06.09.10.
///  Copyright 2010 The(c)ompany. All rights reserved.
///
////////////////////////////////////////////////////////////////////////////////

#	include <iostream>
#	include <sys/types.h>
#	include <sys/stat.h>
#	include <sys/uio.h>
#	include <unistd.h>
#	include <aio.h>
#	include <fcntl.h>
#	include <errno.h>
#	include <math.h>

#	include <stdlib.h>
#	include <stdio.h> // for GLOBAL ns
#	include <string.h>	// ::strerror()
#	include <stdarg.h> // for GLOBAL ns

#	include "accessory.h"

namespace Common
	{
#	ifdef DEF_DEBUG_INLINES // debug versions of dos.h inlined functions:

		Error::Error( const String& msg )
			:	m_msg( msg )
			{
			}

		const char* Common::Error::message() const
			{
				return m_msg;
			}

		void Error::verbose() const
			{
				::puts( message() );
			}
#	endif
	}

namespace File
	{
#	ifdef DEF_DEBUG_INLINES // debug versions of dos.h inlined functions:

		Error::Error( const String& msg )
			:	m_msg( msg )
			{
			}
		
		const char* Error::message() const
			{
				return ::strerror( errno );
			}
		
		void Error::verbose() const
			{
				::perror( m_msg );
			}

		Handle::Handle( const String& str, File::Access::Type type )
			:	m_name( str )
			,	m_access( type )
			//,	m_handle(str.size() ? ::open( m_name.value(), m_access.flags(), S_IREAD | S_IWRITE ) : -2)
			,	m_handle(str.size() ? ::open( m_name, m_access.flags(), S_IREAD | S_IWRITE ) : -2)
			,	m_file(m_handle > 0 ? ::fdopen( m_handle, m_access.mode() ) : 0)
			{
				if (-1 == m_handle || !(m_file))
				{
					throw Error( m_name ); // TODO: set breakpoint to this line.
				}
			}
#	endif
		int const BUF_SIZE = 4096;
		
		unsigned int const Handle::crc32tab[ 256 ] =
			{
				0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
				0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
				0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
				0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
				0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
				0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
				0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
				0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
				0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
				0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
				0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
				0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
				0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
				0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
				0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
				0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
				0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
				0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
				0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
				0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
				0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
				0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
				0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
				0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
				0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
				0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
				0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
				0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
				0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
				0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
				0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
				0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
			};

		unsigned int Handle::crc32calc( const char *buf, unsigned int buflen, unsigned int crc ) const
			{
				if (! crc )
					{
						crc = 0xFFFFFFFF;

						for( unsigned int i=0 ; i<buflen ; ++i )
							{
								crc = crc32tab[ (unsigned char)( crc ^ buf[ i ] )] ^ (( crc >> 8 )& 0x00FFFFFF );
							}

						return crc;
					}
				return 0;
			}

		unsigned int Handle::crc32() const
			{
			//	if (::open( name, O_CREAT | O_RDONLY ) == -1)
			//		{
			//			::perror( name );
			//			return 0;
			//		}

				char* buf = new char[ BUF_SIZE ];
				unsigned int bytes = ::read( m_handle, buf, BUF_SIZE );
				unsigned int crc = 0;
	
				while( bytes )
					{
						crc = crc32calc( buf, bytes, crc );
						bytes = read( buf, BUF_SIZE );
					}

				delete [] buf;
				return -( ++crc );
			}

		int Handle::parse()
			{
				if (m_handle <= 0)
					{
						::perror( m_name ); return -1;
					}
	
				char *linebuf;
				unsigned int bytes;
				unsigned int p;
				unsigned int l = 0;
				bool FLAG_LNS_EXIST;

				const unsigned int CR = 0x0D;
				const unsigned int LF = 0x0A;

				int lines = 0;

				if (! (linebuf = new char[ BUF_SIZE + 2 ]))
					{
						return -1;
					}

				lseek( 0, SEEK_SET );
	
				while (bytes = ::read( m_handle, linebuf, BUF_SIZE ))
					{
						p = 0;
						FLAG_LNS_EXIST = 0;

						for ( l=0 ; l<bytes ; l++ )
							{
								if (linebuf[ l ]== LF)
									{
										linebuf[ l ]= 0;
										FLAG_LNS_EXIST = 1;

										if (linebuf[ l-1 ]== CR)
											{
												linebuf[ l-1 ]= 0;

												if (next_line( ++lines, &linebuf[p], l-p-1 ))
													{
														lines = -1;
														goto error1;
													}
											}
										else if (next_line( ++lines, &linebuf[p], l-p ))
											{
												lines = -1;
												goto error1;
											}
										p = l+1;
									}
								// if (linebuf[ l ]== LF) ...
							}
						// for
		
						if (bytes < BUF_SIZE)
							{
								linebuf[ 0 + bytes ]= 0;
								linebuf[ 1 + bytes ]= 0;
								linebuf[ 2 + bytes ]= 0;
								if (next_line( ++lines, &linebuf[ p ], bytes-p )) // last string
									{
										lines = -1;
										goto error1;
									}
								break;
							}
						else if (FLAG_LNS_EXIST == 0)
							{
								break;
							}

						if ( eof() )
							{
								break;
							}

						for( l=0 ; l<bytes ; l++ )
							{
								linebuf[ l ]= 0;
							}

						lseek( -(bytes-p), SEEK_CUR );

					}
				// while
	
			error1:;
			//	close();
				delete[] linebuf;
				return lines;
			}


		bool Handle::only_spaces( const char *s, int len )
			{
				for( int l=0 ; l<len ; l++ )
					{
						if (s[l] != ' ')
							{
								return false;
							}
					}
				return true;
			}

		bool Handle::next_line( int linenum, const char *line, int length )
			{
				if (length)
				{
					puts( line );
				}
				return false; // no error.
			}
	}// File::
